I have been feeling sick for a week now. I had a soar throat one week ago and was headachey and achy all over. So i took it easy and drank A TON of water and felt a bit better the next day. Then i felt a little sick the next couple days but not horrible. Now i feel worse than before. I have a headache, i can't stop coughing, and i am really congested. What could it be? What are some at home things i could do to shake this thing?